理解这个比较功能（VBScript）

Question

我正在寻找一个比较两个文件版本的VBScript解决方案，并找到了以下代码：

' *****************************************************************
' CompareFileVersion()
' Author: Vincil.Bishop@dhs.state.tx.us
' Date: 6/30/03
'
' This function compares the version numbers of two files and returns the following results:
' -1 = File Version 2 is greater than File Version 1
' 0 = Versions are the same
' 1 = File version 1 is greater than File Version 2
' ****************************************************************************************************

Public Function CompareFileVersion(strFileName1 As String, strFileName2 As String) As Integer

    ' Our result
    ' -1 = File Version 2 is greater than File Version 1
    ' 0 = Versions are the same
    ' 1 = File version 1 is greater than File Version 2
    Dim intResult

    Dim strFileVersion1
    Dim strFileVersion2
    Dim strAryFileVersion1() As String
    Dim strAryFileVersion2() As String

    Dim fs
    Set fs = CreateObject("Scripting.FileSystemObject")

    ' Let's initialize our result with 0
    intResult = 0

    strFileVersion1 = fs.getfileversion(strFileName1)
    strFileVersion2 = fs.getfileversion(strFileName2)

    'Split the two supplied file versions by the "." character
    strAryFileVersion1() = Split(strFileVersion1, ".")
    strAryFileVersion2() = Split(strFileVersion2, ".")

    For i = 0 To UBound(strAryFileVersion1())

        If strAryFileVersion1(i) > strAryFileVersion2(i) Then

            intResult = 1

        ElseIf strAryFileVersion1(i) < strAryFileVersion2(i) Then

            intResult = -1

        End If

        'If we have found that the result is not > or <, no need to proceed
        If intResult <> 0 Then Exit For

    Next

    If UBound(strAryFileVersion2) > UBound(strAryFileVersion1) _
    And strAryFileVersion2(UBound(strAryFileVersion2)) <> 0 Then intResult = -1

    CompareFileVersion = intResult

End Function

设置以下变量时如何使用此功能？

ver1 = "%userprofile%\Desktop\ver1.exe"
ver2 = "%userprofile%\Desktop\ver2.exe"

我认为做以下就足够了，但我给了我一个错误：

result = CompareFileVersion(ver1, ver2)
MsgBox(result)

我显然做错了什么。谁能帮我理解这个？

Answer 1

首先，应声明该函数：

  

Public Function CompareFileVersion（strFileName1，strFileName2）

至于

ver1 = "%userprofile%\Desktop\ver1.exe"
ver2 = "%userprofile%\Desktop\ver2.exe"

我们使用WScript.Shell获得的用户个人资料：

Set oShell = CreateObject("WScript.Shell")
strUser = oShell.ExpandEnvironmentStrings("%USERPROFILE%")

ver1 = strUser+"\Desktop\ver1.exe"

此外，删除所有类型声明，例如

  

As String

。 VBScript只有一种称为 Variant 的数据类型。

Answer 2

功能已更正，现在适用于VBScript（感谢Mihai Adrian）：

' *****************************************************************
' CompareFileVersion()
' Author: Vincil.Bishop@dhs.state.tx.us
' Date: 6/30/03
'
' This function compares the version numbers of two files and returns the following results:
' -1 = File Version 2 is greater than File Version 1
' 0 = Versions are the same
' 1 = File version 1 is greater than File Version 2
' ****************************************************************************************************

Public Function CompareFileVersion(strFileName1, strFileName2)

    ' Our result
    ' -1 = File Version 2 is greater than File Version 1
    ' 0 = Versions are the same
    ' 1 = File version 1 is greater than File Version 2
    Dim intResult

    Dim strFileVersion1
    Dim strFileVersion2
    Dim strAryFileVersion1
    Dim strAryFileVersion2

    Dim fs
    Set fs = CreateObject("Scripting.FileSystemObject")

    ' Let's initialize our result with 0
    intResult = 0

    strFileVersion1 = fs.getfileversion(strFileName1)
    strFileVersion2 = fs.getfileversion(strFileName2)

    'Split the two supplied file versions by the "." character
    strAryFileVersion1 = Split(strFileVersion1, ".")
    strAryFileVersion2 = Split(strFileVersion2, ".")

    For i = 0 To UBound(strAryFileVersion1)

        If strAryFileVersion1(i) > strAryFileVersion2(i) Then

            intResult = 1

        ElseIf strAryFileVersion1(i) < strAryFileVersion2(i) Then

            intResult = -1

        End If

        'If we have found that the result is not > or <, no need to proceed
        If intResult <> 0 Then Exit For

    Next

    If UBound(strAryFileVersion2) > UBound(strAryFileVersion1) _
    And strAryFileVersion2(UBound(strAryFileVersion2)) <> 0 Then intResult = -1

    CompareFileVersion = intResult

End Function

使用以下代码调用它：

file1 = "C:\somewhere\file1.exe"
file2 = "C:\somewhere\file2.exe"

MsgBox(CompareFileVersion(file1, file2))

这将返回：

• 0 如果文件版本相同
• 1 如果file1的版本比file2
更新（更新）
• -1 如果file2的版本比file1
更新（更新）